Optical projection apparatus

Abstract

An optical projection apparatus includes an illumination system, a projection lens unit, a reflective light valve, a first beam breaker and a second beam breaker. A light beam is provided by the illumination system. The projection lens unit and the reflective light valve are disposed on the transmission path of the light beam, and the reflective light valve is disposed between the illumination system and the projection lens unit. The first beam breaker and the second beam breaker are used to cut into the transmission path of the light beam from different directions to block a part of the light beam, and part of the light beam passes through the first beam breaker and the second beam breaker. The darker image projected by the optical projection apparatus has higher contrast and better uniformity.

1 . An optical projection apparatus, comprising: 
 an illumination system for providing a light beam;    a projection lens unit disposed on a transmission path of the light beam;    a reflective light valve disposed between the illumination system and the projection lens unit and on the transmission path of the light beam;    a first beam breaker; and    a second beam breaker, wherein the first beam breaker and the second beam breaker cut into the transmission path of the light beam from different directions to respectively block a portion of the light beam and let the other portion of the light beam pass.    
   
   
       2 . The optical projection apparatus of  claim 1 , wherein the first beam breaker and the second beam breaker are disposed on the projection lens unit, and the first beam breaker and the second beam breaker cut into the transmission path of the light beam in the projection lens unit.  
   
   
       3 . The optical projection apparatus of  claim 1 , wherein the first beam breaker and the second beam breaker are disposed in the illumination system, and the first beam breaker and the second beam breaker cut into the transmission path of the light beam in the illumination system.  
   
   
       4 . The optical projection apparatus of  claim 1 , wherein the first beam breaker is disposed in the illumination system and cuts into the transmission path of the light beam in the illumination system, the second beam breaker being disposed on the projection lens unit and cutting into the transmission path of the light beam in the projection lens unit.  
   
   
       5 . The optical projection apparatus of  claim 1 , wherein each of the first beam breaker and the second beam breaker comprises a plurality of holes.  
   
   
       6 . The optical projection apparatus of  claim 1 , wherein the illumination system comprises a light source, and the light source comprises a plurality of output powers, wherein during a period when the first beam breaker and the second beam breaker cut into the transmission path of the light beam from different directions, the light source outputs a first power, the light source outputting a second power during the other period, the second power being larger than the first power.  
   
   
       7 . The optical projection apparatus of  claim 1 , further comprising a light attenuator disposed in the illumination system, wherein the light attenuator cuts into the transmission path of the light beam in the illumination system.  
   
   
       8 . The optical projection apparatus of  claim 7 , wherein the illumination system has a light integration rod and a relay lens, the light attenuator cutting into the transmission path of the light beam between the light integration rod and the relay lens.  
   
   
       9 . The optical projection apparatus of  claim 1 , wherein the reflective light valve comprises a digital micro-mirror device (DMD) or a liquid crystal on silicon (LCOS) panel.  
   
   
       10 . An optical projection apparatus, comprising: 
 an illumination system having a light source for providing a light beam, the light source having multiple output powers;    a projection lens unit disposed on a transmission path of the light beam;    a reflective light valve disposed between the illumination system and the projection lens unit and on the transmission path of the light beam; and    a beam breaker disposed on the projection lens unit, the beam breaker cutting into the projection lens unit to block a portion of the light beam, wherein during a period when the beam breaker cuts into projection lens unit, the light source outputs a first power, the light source outputting a second power during the other period, the second power being larger than the first power.    
   
   
       11 . The optical projection apparatus of  claim 10 , further comprising a light attenuator disposed in the illumination system, the light attenuator cutting into the transmission path of the light beam in the illumination system.  
   
   
       12 . The optical projection apparatus of  claim 11 , wherein the illumination system comprises a light integration rod and a relay lens, the light attenuator cutting into the transmission path of the light beam between the light integration rod and the relay lens.  
   
   
       13 . The optical projection apparatus of  claim 10 , wherein the beam breaker has a plurality of holes.  
   
   
       14 . The optical projection apparatus of  claim 10 , wherein the reflective light valve comprises a digital micro-mirror device (DMD) or a liquid crystal on silicon (LCOS) panel.  
   
   
       15 . An optical projection apparatus, comprising: 
 an illumination system for providing a light beam;    a projection lens unit disposed on a transmission path of the light beam;    a reflective light valve disposed between the illumination system and the projection lens unit and on the transmission path of the light beam;    a beam breaker disposed on the projection lens unit, the beam breaker cutting into the projection lens unit to block a portion of the light beam; and    a light attenuator disposed in the illumination system, wherein the light attenuator cuts into the transmission path of the light beam in the illumination system.    
   
   
       16 . The optical projection apparatus of  claim 15 , wherein the illumination system has a light integration rod and a relay lens, the light attenuator cutting into the transmission path of the light beam between the light integration rod and the relay lens.  
   
   
       17 . The optical projection apparatus of  claim 15 , wherein the beam breaker has a plurality of holes.  
   
   
       18 . The optical projection apparatus of  claim 15 , wherein the reflective light valve comprises a digital micro-mirror device (DMD) or a liquid crystal on silicon (LCOS) panel.  
   
   
       19 . An optical projection apparatus, comprising: 
 an illumination system for providing a light beam;    a projection lens unit disposed on a transmission path of the light beam;    a reflective light valve disposed between the illumination system and the projection lens unit and on the transmission path of the light beam; and    a beam breaker disposed on the projection lens unit, wherein the beam breaker cuts into the projection lens unit to block a portion of the light beam, the beam breaker having a plurality of holes.    
   
   
       20 . The optical projection apparatus of  claim 19 , wherein the reflective light valve comprises a digital micro-mirror device (DMD) or a liquid crystal on silicon (LCOS) panel.